0g-chain/contracts/test/ERC20KavaWrappedCosmosCoin.test.ts

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import { expect } from "chai";
import { Signer } from "ethers";
import { ethers } from "hardhat";
import {
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ERC20ZgChainWrappedCosmosCoin,
ERC20ZgChainWrappedCosmosCoin__factory as ERC20ZgChainWrappedCosmosCoinFactory,
} from "../typechain-types";
const decimals = 6n;
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describe("ERC20ZgChainWrappedCosmosCoin", function () {
let erc20: ERC20ZgChainWrappedCosmosCoin;
let erc20Factory: ERC20ZgChainWrappedCosmosCoinFactory;
let owner: Signer;
let sender: Signer;
beforeEach(async function () {
erc20Factory = await ethers.getContractFactory(
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"ERC20ZgChainWrappedCosmosCoin"
);
erc20 = await erc20Factory.deploy("Wrapped ATOM", "ATOM", decimals);
[owner, sender] = await ethers.getSigners();
});
describe("decimals", function () {
it("should be the same as deployed", async function () {
expect(await erc20.decimals()).to.be.equal(decimals);
});
});
describe("mint", function () {
it("should reject non-owner", async function () {
const tx = erc20.connect(sender).mint(await sender.getAddress(), 10n);
await expect(tx).to.be.revertedWith("Ownable: caller is not the owner");
});
it("should be callable by owner", async function () {
const amount = 10n;
const tx = erc20.connect(owner).mint(await sender.getAddress(), amount);
await expect(tx).to.not.be.reverted;
const bal = await erc20.balanceOf(await sender.getAddress());
expect(bal).to.equal(amount);
});
});
describe("burn", function () {
it("should reject non-owner", async function () {
const tx = erc20.connect(sender).burn(await sender.getAddress(), 10n);
await expect(tx).to.be.revertedWith("Ownable: caller is not the owner");
});
it("should let owner burn some of the tokens", async function () {
const amount = 10n;
// give tokens to an account
const fundTx = erc20
.connect(owner)
.mint(await sender.getAddress(), amount);
await expect(fundTx).to.not.be.reverted;
const balBefore = await erc20.balanceOf(await sender.getAddress());
expect(balBefore).to.equal(amount);
// burn the tokens!
const burnTx = erc20
.connect(owner)
.burn(await sender.getAddress(), amount);
await expect(burnTx).to.not.be.reverted;
const balAfter = await erc20.balanceOf(await sender.getAddress());
expect(balAfter).to.equal(0);
});
it("should let owner burn all the tokens", async function () {
const amount = 10n;
// give tokens to an account
const fundTx = erc20
.connect(owner)
.mint(await sender.getAddress(), amount);
await expect(fundTx).to.not.be.reverted;
const balBefore = await erc20.balanceOf(await sender.getAddress());
expect(balBefore).to.equal(amount);
// burn the tokens!
const burnAmount = 7n;
const burnTx = erc20
.connect(owner)
.burn(await sender.getAddress(), burnAmount);
await expect(burnTx).to.not.be.reverted;
const balAfter = await erc20.balanceOf(await sender.getAddress());
expect(balAfter).to.equal(amount - burnAmount);
});
it("should error when trying to burn more than balance", async function () {
const amount = 10n;
// give tokens to an account
const fundTx = erc20
.connect(owner)
.mint(await sender.getAddress(), amount);
await expect(fundTx).to.not.be.reverted;
const balBefore = await erc20.balanceOf(await sender.getAddress());
expect(balBefore).to.equal(amount);
// burn the tokens!
const burnAmount = amount + 1n;
const burnTx = erc20
.connect(owner)
.burn(await sender.getAddress(), burnAmount);
await expect(burnTx).to.be.revertedWith(
"ERC20: burn amount exceeds balance"
);
});
});
});